139 lines
4.3 KiB
Plaintext
139 lines
4.3 KiB
Plaintext
set tidb_cost_model_version=1;
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create table t1(a varchar(20) charset utf8);
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insert into t1 values ("t1_value");
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alter table t1 collate uTf8mB4_uNiCoDe_Ci charset Utf8mB4 charset uTF8Mb4 collate UTF8MB4_BiN;
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alter table t1 modify column a varchar(20) charset utf8mb4;
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select * from t1;
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a
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t1_value
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create table t(a varchar(20) charset latin1);
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insert into t values ("t_value");
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alter table t modify column a varchar(20) charset latin1;
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select * from t;
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a
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t_value
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alter table t modify column a varchar(20) charset utf8;
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Error 8200 (HY000): Unsupported modify charset from latin1 to utf8
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drop table t;
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create table t(a varchar(20) charset latin1);
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insert into t values ("t_value");
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alter table t modify column a varchar(20) charset utf8mb4;
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admin check table t;
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select * from t;
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a
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t_value
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drop table t;
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create table t(a varchar(20) charset latin1);
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insert into t values ("t_value");
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alter table t modify column a varchar(20) charset utf8mb4 collate utf8mb4_general_ci;
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admin check table t;
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select * from t;
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a
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t_value
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drop table t;
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create table t(a varchar(20) charset latin1);
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insert into t values ("t_value");
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alter table t modify column a varchar(20) charset utf8 collate utf8_bin;
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Error 8200 (HY000): Unsupported modify charset from latin1 to utf8
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alter table t modify column a varchar(20) charset utf8mb4 collate utf8bin;
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Error 1273 (HY000): Unknown collation: 'utf8bin'
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alter table t collate LATIN1_GENERAL_CI charset utf8 collate utf8_bin;
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Got one of the listed errors
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alter table t collate LATIN1_GENERAL_CI collate UTF8MB4_UNICODE_ci collate utf8_bin;
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Got one of the listed errors
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drop table t;
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create table t(a varchar(20) charset latin1);
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insert into t values ("t_value");
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alter table t modify column a varchar(19) charset utf8mb4;
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admin check table t;
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select * from t;
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a
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t_value
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create database if not exists cd_test_utf8 CHARACTER SET utf8 COLLATE utf8_bin;
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create database if not exists cd_test_latin1 CHARACTER SET latin1 COLLATE latin1_swedish_ci;
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use cd_test_utf8;
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select @@character_set_database;
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@@character_set_database
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utf8
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select @@collation_database;
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@@collation_database
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utf8_bin
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use cd_test_latin1;
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select @@character_set_database;
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@@character_set_database
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utf8
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select @@collation_database;
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@@collation_database
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utf8_bin
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create database if not exists test_db CHARACTER SET latin1 COLLATE latin1_swedish_ci;
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with cte as (select cast('2010-09-09' as date) a union select '2010-09-09 ') select count(*) from cte;
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count(*)
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1
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set names utf8mb4 collate utf8mb4_general_ci;
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select position('a' in 'AA');
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position('a' in 'AA')
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1
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select locate('a', 'AA');
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locate('a', 'AA')
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1
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select locate('a', 'a');
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locate('a', 'a')
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1
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set names utf8mb4;
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SELECT default_collate_name, maxlen FROM information_schema.character_sets ORDER BY character_set_name;
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default_collate_name maxlen
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ascii_bin 1
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binary 1
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gbk_chinese_ci 2
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latin1_bin 1
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utf8_bin 3
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utf8mb4_bin 4
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SELECT character_set_name, id, sortlen FROM information_schema.collations ORDER BY collation_name, id;
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character_set_name id sortlen
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ascii 65 1
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binary 63 1
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gbk 87 1
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gbk 28 1
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latin1 47 1
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utf8 83 1
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utf8 33 1
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utf8 192 1
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utf8mb4 255 1
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utf8mb4 309 1
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utf8mb4 46 1
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utf8mb4 45 1
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utf8mb4 224 1
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select * from information_schema.COLLATION_CHARACTER_SET_APPLICABILITY where COLLATION_NAME='utf8mb4_bin';
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COLLATION_NAME CHARACTER_SET_NAME
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utf8mb4_bin utf8mb4
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show charset;
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Charset Description Default collation Maxlen
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ascii US ASCII ascii_bin 1
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binary binary binary 1
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gbk Chinese Internal Code Specification gbk_chinese_ci 2
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latin1 Latin1 latin1_bin 1
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utf8 UTF-8 Unicode utf8_bin 3
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utf8mb4 UTF-8 Unicode utf8mb4_bin 4
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show collation;
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Collation Charset Id Default Compiled Sortlen
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ascii_bin ascii 65 Yes Yes 1
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binary binary 63 Yes Yes 1
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gbk_bin gbk 87 Yes 1
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gbk_chinese_ci gbk 28 Yes Yes 1
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latin1_bin latin1 47 Yes Yes 1
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utf8_bin utf8 83 Yes Yes 1
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utf8_general_ci utf8 33 Yes 1
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utf8_unicode_ci utf8 192 Yes 1
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utf8mb4_0900_ai_ci utf8mb4 255 Yes 1
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utf8mb4_0900_bin utf8mb4 309 Yes 1
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utf8mb4_bin utf8mb4 46 Yes Yes 1
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utf8mb4_general_ci utf8mb4 45 Yes 1
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utf8mb4_unicode_ci utf8mb4 224 Yes 1
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create database if not exists cd_test_utf8mb4_0900_bin;
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use cd_test_utf8mb4_0900_bin;
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create table t (id varchar(255) primary key clustered, a varchar(255) collate utf8mb4_0900_bin, b varchar(255) collate utf8mb4_bin, key idx(a, b));
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insert into t values ("1", "a ", "a");
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select /*+USE_INDEX(t, idx)*/ * from t;
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id a b
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1 a a
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